Dust bag for pneumatic cleaners



Sept. 6, 1938. T. E. SPENCE DUST BAG FOR PNEUMATIC CLEANERS Filed July 2, 1957 illllil iii: 10

INVENTOR MA ATTORNEYS Patented Sept. 6, 1938 UNITED STATES PATENT orricr.

3 Claims.

My invention relates toimprovements in dust bags for pneumatic sweepers and cleaners.

The object of my invention is to provide a dust bag fora pneumatic sweeper which is so constructed as to be readily and quickly opened and effectively closed in a dust removal or dumping operation.

More specifically stated, it is the object of my invention to provide for complete opening of a dust bag of the type described at the bags largest dimension, and still to provide a construction which will give an effective closure which will prevent escape of dust in the operation of the sweeper.

In the drawing:

Figure 1 is a side elevation of my sweeper bag and showing in dotted lines a conventional type of vacuum cleaner with which my dust bag may be assembled.

Figure 2 is a vertical section through a cleaner bag made in accord with my invention.

Figure 3 is a detail in section showing the relation of the parts making'up the joint use-d inmy improved bag.

Figure 4 is a diagrammatic view of one loop of my bag opening, being inserted into the other loop in the closing or opening of my dust bag.

Like parts are designated by the same reference characters throughout the several views.

The ordinary vacuum cleaner I0, as shown in somewhat conventional form in dotted lines in Fig. 1, is provided with a fan in a housing II whereby to draw air through a dust pickup nozzle I2 and deliver it through a delivery conduit I3 into a bag I4 which is usually made of fairly closely woven fabric. The bag I4 is usually in clamping or bayonet connection with the conduit I3 at I5, and in many of the sweeper bag constructions heretofore used, the only method of dumping the bag I 4 is to disconnect the upper portion of the bag from the sweeper handle I6 by unhooking some portion of the supporting chain at I I, then by unhooking the bayonet connection I 5 all of the dust theretofore accumulated in the bag I4 must be removed through the small orifice at I5. This operation requires that the matted quantities of dust and threads picked up by the nozzle I2 must be manually plucked through the small opening at I5.

I therefore provide a bag I4 which is provided with a joint I8 at an intermediate point between the bayonet connection I5 and the upper tip I9 of the bag, and I have found that a joint approximately in the middle of the bag, at its largest 55 dimension, is most satisfactory. It is with the placing of this joint at an intermediate point at a large dimension of the bag and the formation of the joint in the particular manner now to be described, that my invention is concerned.

A joint formed at I8 as indicated must be substantially air tight during the operation of the cleaner, and must still be subject to ready disengagement when a dust disposal operation is to be accomplished. I therefore form a fairly large hem in each of the margins formed by the severing of the bag along the lines indicated in the drawing, thus providing a loop of the fabric material of the bag I l in each of said margins to receive a heavy spring wire loop in one of said hems 2!, which shall hereafter be called the outer loop. I provide a lighter spring wire loop 22 in the other of said hems 23. The wire loop 22 is of identical diameter with that of outer loop 20, and is only receivable into its inner position, locked behind a shoulder 24 formed by the outer loop 20 and its hem 2i, by distortion of the wire loop 22, as shown in Fig. 4. After the inner loop 22 has been distorted to form an ovoid loop for insertion through the outer loop 20, it may be released to again assume a circular configuration which will naturally assume a position concentric with the outer loo-p 20 and where it will rest against the shoulder 24.

When my improved bag i4 is under pressure of air delivered through the conduit I3, the joint at I8 is practically pneumatically sealed, for the pressure from within forces the material of the large hem 23 against the hem 2|, and the increased pressure of the loop 22 against the loop 20 assists in sealing the joint.

It will be noted that by reason of the size of the hems 2I and 23, the stitching 25 and 26 used to form the hems is not in position to disturb the smooth surface of the fabric at the point where the loops are brought to bear upon one another.

When a bag constructed as above described is to be opened for the disposal of dust, the manipulation of the loop 22 while the bag is not under internal pneumatic pressure, will result in the distortion of the loop 22 into the ovoid form shown in Fig. 4 to permit of the release of the loop 22 from the loop 20. Immediately, therefore, the two halves of the bag I4 are wide open for the release of the accumulated dust and dirt, and no picking or removal of packed dirt in a small orifice is necessary.

I claim:

1. In a cleaner operable on the principle of air movement, a bag for the reception of dustladen air, said bag being provided intermediate its ends with a line of severance of the parts thereof, the meeting margins of said parts being provided with wire-like loops of substantially identical diameter, one of said loops comprising an inner reinforcement receivable within the outer loop by distortion.

2. A vacuum cleaner bag having an inlet opening and being provided with two severable parts severable along a line spaced from said inlet opening, said parts being provided with margins hemmed to receive spring reinforcing wire-like loops, one of said loops comprising a reinforcement for an outer member for the joint to be formed thereby, and the other of said loops being larger in circumference than the opening defined by said outer loop, whereby said second loop may only be receivable through the outer loop when said second loop is in distorted configuration.

3. In a vacuum cleaner bag formed of two parts for ready separation for dust disposal, each of said parts being provided with a hem, a wirelike loop of substantial thickness in cross section receivable in one of said hems to form an outer loop with an inwardly disposed shoulder, and an inner loop disposed in the other of said hems receivable in abutment against said shoulder.

THOMAS E. SPENCE. 

